Average annual temperature is 17.1 °C
Absolute maximum temperature: 33.9 °C
Absolute minimum temperature: -2.9 °C
Number of sunny days: 143 days
Number of rainy days: 220 days
Number of snow days: 2 days
Look at detailed online map of Ōihama
* Weather data for Ōihama Japan is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 14.7 | 17.1 | 19.5 | 24.5 | 27.3 | 29.3 | 32.2 | 33.9 | 33.7 | 27.3 | 25.6 | 21.5 |
| Average daytime temperature (°C) | 9.3 | 10.0 | 15.0 | 18.0 | 21.7 | 25.0 | 29.7 | 31.3 | 29.7 | 23.0 | 17.7 | 12.0 |
| Average temperature (°C) | 6.6 | 6.8 | 11.5 | 14.5 | 18.5 | 22.1 | 26.7 | 28.2 | 26.5 | 19.6 | 14.6 | 9.3 |
| Average night temperature (°C) | 4.0 | 3.7 | 8.0 | 11.3 | 15.7 | 19.6 | 24.3 | 25.7 | 24.0 | 16.7 | 11.9 | 6.7 |
| Absolute minimum temperature (°C) | -2.9 | 0.1 | 1.1 | 8.8 | 11.2 | 14.2 | 20.8 | 24.3 | 21.6 | 12.8 | 6.6 | 1.2 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 |
| Daylight mean duration (h) | 10.2 | 11.0 | 12.0 | 13.0 | 13.9 | 14.4 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 6.9 | 7.2 | 8.5 | 8.0 | 9.0 | 7.3 | 9.8 | 9.9 | 9.1 | 8.4 | 7.9 | 7.1 |
| Precipitation (mm) | 62 | 50 | 115 | 227 | 230 | 253 | 121 | 137 | 63 | 28 | 64 | 53 |
| Sunny days | 15 | 14 | 17 | 17 | 14 | 11 | 7 | 3 | 5 | 16 | 13 | 11 |
| Rainy days | 16 | 14 | 14 | 13 | 17 | 19 | 24 | 28 | 25 | 15 | 17 | 18 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
The largest precipitation sum in Ōihama is at